Ultrasonography in Pelvic Floor Dysfunction.

Area of Science:

• Obstetrics and Gynecology
• Medical Imaging
• Pelvic Floor Disorders

Background:

• Obstetric anal sphincter injury (OASI) and levator ani muscle (LAM) trauma are prevalent conditions in parous women.
• These injuries can lead to significant long-term morbidity.
• Early and accurate diagnosis is crucial for effective management.

Purpose of the Study:

• To review and summarize the sonographic signs associated with OASI.
• To describe the sonographic manifestations of LAM trauma.
• To highlight the utility of ultrasound in diagnosing these postpartum pelvic floor injuries.

Main Methods:

• Review of published sonographic findings in cases of OASI.
• Description of sonographic signs indicative of LAM trauma, including discontinuity and increased hiatal area.
• Emphasis on characteristic ultrasound features such as sphincter discontinuity, thickening/thinning patterns, and mucosal abnormalities.

Main Results:

• Four key sonographic signs for OASI have been identified: sphincter discontinuity, external anal sphincter thickening post-repair, internal anal sphincter thinning with opposite thickening (half-moon sign), and mucosal fold abnormalities (mucosal star sign).
• The primary sonographic sign for levator trauma is LAM discontinuity.
• Severe levator trauma may present as an increased hiatal area on ultrasound.

Conclusions:

• Ultrasound is a valuable tool for diagnosing OASI and LAM trauma in parous women.
• Specific sonographic signs can aid in identifying the extent and nature of these injuries.
• Recognizing these ultrasound findings can improve patient outcomes through timely intervention.